ie6b03729_si_001.pdf (408.92 kB)
Mass Transfer of CO2 in a Carbonated Water–Oil System at High Pressures
journal contribution
posted on 2016-12-09, 00:00 authored by Guanli Shu, Mingzhe Dong, Shengnan Chen, Hassan HassanzadehIn this paper, CO2 diffusion
coefficients in a carbonate
water–oil system are determined by measuring the pressure buildup
in the closed water–oil system experimentally and modeling
the pressure change mathematically. The mathematical method of investigating
one-dimensional, time-dependent heat conduction in a composite medium
is adopted to solve the mass transfer problem between two liquid phases.
The model is combined with well-designed trial-and-error method to
determine diffusion coefficients of CO2 in both water and
oil phases at the same time. The model considers a moving interface
between carbonated water and oil as well as variations of interface
concentrations of CO2 in these two phases, which more effectively
conforms to reality. Results show that the pressure buildup during
the diffusion process resulted from the increased density and swelling
of the oil phase. The diffusion coefficient of CO2 in the
water phase plays a major role in the interphase mass transfer process.